void do_tests()
{
	write_file("/rename_test", "Hmm.");
	rename("/rename_test", "/ren_test");
	ASSERT(file_size("/rename_test") == -1);
	ASSERT(read_file("/ren_test") == "Hmm.");
	rename("/ren_test", "/single");
	ASSERT(file_size("/ren_test") == -1);
	ASSERT(read_file("/single/ren_test") == "Hmm.");
	rm("/single/ren_test");
}
